Openstack snapshot create and restore scripting with bash commands - bash

Question

First of all it amazes me there is so little information about openstack and script examples but that is not the question i have
I want to create a snapshot and an simple way to restore the snapshot. Because the way of our hosting provider uses underlying storage i am unable to use the rebuild command so i need to destroy the running vm and recreate it with the snapshot image as a base. The creation of the image only works when all information about the running vm is provided as input parameters and here comes the troubles i have.
the information needed is provided by 3 commands
command1: nova show
Output:
+--------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Property | Value |
+--------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NWFINFRA_1600 network | 10.0.0.39 |
| OS-DCF:diskConfig | MANUAL |
| OS-EXT-AZ:availability_zone | gn3a |
| OS-EXT-STS:power_state | 1 |
| OS-EXT-STS:task_state | - |
| OS-EXT-STS:vm_state | active |
| OS-SRV-USG:launched_at | 2019-10-02T14:25:21.000000 |
| OS-SRV-USG:terminated_at | - |
| accessIPv4 | |
| accessIPv6 | |
| config_drive | |
| created | 2019-10-02T14:25:05Z |
| description | - |
| flavor:disk | 0 |
| flavor:ephemeral | 0 |
| flavor:extra_specs | {"ostype": "win", "hw:cpu_cores": "1", "hw:cpu_sockets": "2"} |
| flavor:original_name | win.2large |
| flavor:ram | 8192 |
| flavor:swap | 0 |
| flavor:vcpus | 2 |
| hostId | 18aa94c61106a53b2d9e672e93619a6fce76abb1ee6ba9da471491f9 |
| id | 70941fbf-9143-4f1c-a5e7-979f818ace23 |
| image | IFW039-InstanceSnapshot (8ee1104d-55e4-4c99-93e5-ceb4a53ce13f) |
| key_name | - |
| locked | False |
| metadata | {} |
| name | IWF039 |
| os-extended-volumes:volumes_attached | [{"id": "1134fe12-777b-4c26-ac2b-e6ecb6ad4f70", "delete_on_termination": false}, {"id": "f610a46e-46ad-460f-81b3-e2b34acfbbfc", "delete_on_termination": false}] |
| progress | 0 |
| status | ACTIVE |
| tags | [] |
| tenant_id | 4c15fd467dde4bd6a25427d6bab64a7f |
| trusted_image_certificates | - |
| updated | 2019-10-02T14:25:21Z |
| user_id | ddff2ce854114bef873bac9a1476805e |
+--------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------+
Command 2: ./Scripts/openstack port show NWFINFRA_1600_IWF039
where NWFINFRA_1600_IWF039 is a combination of previous output NWFINFRA_1600 network and the server name IWF039
Output:
+-------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field | Value |
+-------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| admin_state_up | UP |
| allowed_address_pairs | |
| binding_host_id | None |
| binding_profile | None |
| binding_vif_details | None |
| binding_vif_type | None |
| binding_vnic_type | normal |
| created_at | 2019-10-02T06:49:08Z |
| data_plane_status | None |
| description | |
| device_id | 70941fbf-9143-4f1c-a5e7-979f818ace23 |
| device_owner | compute:gn3a |
| dns_assignment | fqdn='iwf039.rijkscloud.local.', hostname='iwf039', ip_address='10.0.0.39' |
| dns_domain | |
| dns_name | iwf039 |
| extra_dhcp_opts | |
| fixed_ips | ip_address='10.0.0.39', subnet_id='3298e8d0-b317-465c-8757-c1a4f2cad298' |
| id | b49a7d3a-bb0d-49cb-a04b-64c5dbf9df20 |
| location | cloud='', project.domain_id='default', project.domain_name=, project.id='4c15fd467dde4bd6a25427d6bab64a7f', project.name='vws-pgb', region_name='Groningen3', zone= |
| mac_address | fa:16:3e:99:cc:3c |
| name | NWFINFRA_1600_IWF039 |
| network_id | 450dcc7a-5e55-4e38-9f4e-de9a9c685502 |
| port_security_enabled | False |
| project_id | 4c15fd467dde4bd6a25427d6bab64a7f |
| propagate_uplink_status | None |
| qos_policy_id | None |
| resource_request | None |
| revision_number | 15 |
| security_group_ids | |
| status | ACTIVE |
| tags | |
| trunk_details | None |
| updated_at | 2019-10-03T11:10:00Z |
+-------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------+
with these outputs i can create the build command to restore the snapshot:
nova boot --poll --flavor win.2large --image IFW039-InstanceSnapshot --security-groups default --availability-zone gn3a --nic net-id=450dcc7a-5e55-4e38-9f4e-de9a9c685502 IWF039
note: the image is the name of the created snapshot
I try to script this so i can have a simple snapshot create and restore procedure
but i get stuck on the table layout of the output. This shows really nice but i cannot use it in my scripting to redirect the output to input variables.
I tryed using this: { read foo ; read ID Name MAC IP status;} < <(./Scripts/openstack port list --server IWF039 | sed 's/+--------------------------------------+----------------------+-------------------+--------------------------------------------------------------------------+-------- +//' | sed 's/|//' | sed 's/MAC Address/MAC/' | sed 's/Fixed IP Addresses/IP/')
But the variables get contents like '|' char etc.
So echo $Name gives '|' as output.
There must be a simpler way but i am unable to see it.
Please help ...
I managed to get it almost working by using awk instead of grep:
i have now this code:
#/bin/bash # # Query needed variables # echo -e "\nQuery needed information" NETWORK=$(nova show IWF039 | awk '/network/ {print $2}') ZONE=$(nova show IWF039 | awk '/OS-EXT-AZ:availability_zone/ {print $4}') FLAVOR=$(nova show IWF039 | awk '/flavor:original_name/ {print $4}') SERVERID=$(nova show IWF039 | awk -F '|' '/id/ {print $3; exit}') NETWORKPORT=$(nova interface-list IWF039 | awk -F '|' '/ACTIVE/ {print $3}') # Print out variables echo "network: $NETWORK" echo "zone: $ZONE" echo "flavor: $FLAVOR" echo "server_id: $SERVERID" echo "network_port_id: $NETWORKPORT" # Remove current instance echo -e "\nRemove current instance" nova delete $SERVERID # Rebuild instance from snapshot image echo -e "\nRebuild instance from snapshot" nova boot --poll --flavor $FLAVOR --image IFW039-InstanceSnapshot2 --security-groups default --availability-zone $ZONE --nic port-id=$NETWORKPORT IWF039
If i run the script the last item however e.g. IWF039 which is the name of the instance i want to use throws me an error:
error: unrecognized arguments: IWF039
anyone can tell me why ?
If i run the line on the commandline it works, only not from the bash script

Answer 1

#/bin/bash
#
# Script restores snapshot created in OpenStack
# Script created by Lex IT, Alex Flora
# usage: snapshot-restore.sh <snapshot image name> <server name to restore to>
# to use: make sure to install the following python openstack modules:
# pip install python-openstackclient python-keystoneclient python-glanceclient python-novaclient python-neutronclient
#
#
# Query needed variables
#
if [ "$#" -eq "0" ]
then
echo -e "usage: restore_snapshot <name of snapshot> <name of server>"
echo -e "Querying available snapshots, one moment please ..."
glance image-list
echo -e "\n\033[0;33mGive name of snapshot to restore"
echo -e "\033[0m"
read SNAPSHOT
echo -e "\n\033[0;33mGive server name to restore"
echo -e "\033[0m"
read SERVER
else
SNAPSHOT=$1
SERVER=$2
fi
echo -e "\n\033[0mQuery needed server information from server $SERVER, one moment please ..."
NETWORK=$(nova show IWF039 | awk '/network/ {print $2}' | sed -e 's/^[[:space:]]*//')
ZONE=$(nova show IWF039 | awk '/OS-EXT-AZ:availability_zone/ {print $4}' | sed -e 's/^[[:space:]]*//')
FLAVOR=$(nova show IWF039 | awk '/flavor:original_name/ {print $4}' | sed -e 's/^[[:space:]]*//')
SERVERID=$(nova show IWF039 | awk -F '|' '/\<id\>/ {print $3; exit}' | sed -e 's/^[[:space:]]*//')
NETWORKPORT=$(nova interface-list IWF039 | awk -F '|' '/ACTIVE/ {print $3}' | sed -e 's/^[[:space:]]*//')
# Print out variables
echo -e "\033[0mnetwork: \033[0;32m$NETWORK"
echo -e "\033[0mzone: \033[0;32m$ZONE"
echo -e "\033[0mflavor: \033[0;32m$FLAVOR"
echo -e "\033[0mserver_id: \033[0;32m$SERVERID"
echo -e "\033[0mnetwork_port_id: \033[0;32m$NETWORKPORT"
echo -e "\033[0mSnapshot image: \033[0;32m$SNAPSHOT"
echo -e "\033[0mServer naam: \033[0;32m$SERVER"
# Ask confirmation
echo -e "\n\033[0mGoing to restore snapshot image $SNAPSHOT to server $SERVER"
read -p "Is this correct (y/n) ? " -n 1 -r
if [[ $REPLY =~ ^[Yy]$ ]]
then
# Remove current instance
echo -e "\n\033[0mRemove current instance"
nova delete $SERVERID
sleep 3
# Rebuild instance from snapshot image
echo -e "\nRebuild instance from snapshot using command:"
echo -e "\033[0mnova boot --poll --flavor $FLAVOR --image $SNAPSHOT --security-groups default --availability-zone $ZONE --nic port-id=$NETWORKPORT $SERVER"
nova boot --poll --flavor $FLAVOR --image $SNAPSHOT --security-groups default --availability-zone $ZONE --nic port-id=$NETWORKPORT $SERVER
fi
This is my complete script. Problem was that the output contained spaces in front of the string. I resolved this with the following sed command: sed -e 's/^[[:space:]]*//'
Hopefully someone has some use of the script.